Windows 7 bootmgr is missing-- Resolved Using WinRE

Perform the following methods to resolve the issue:  Method 1: Startup Repair from the Windows Recovery Environment (WinRE)
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1. Insert the Windows 7 installation disc into the disc drive, and then start the computer.
2. Press a key when the message indicating "Press any key to boot from CD or DVD …". appears.
3. Select a language, a time and currency, and a keyboard or input method, and then click Next. 
4. Click Repair your computer.
5. In the System Recovery Options dialog box, choose the drive of your Windows installation and click Next.
6. At the System Recovery Options Dialog Box, click on Repair your computer.
7. Click the operating system that you want to repair, and then click Next.
8. In the System Recovery Options dialog box, click Startup Repair.

Refer the following link for more information:
http://windows.microsoft.com/en-US/windows7/What-are-the-system-recovery-options-in-Windows-7
To know more about “Startup Repair” visit the following link:
http://windows.microsoft.com/en-us/windows7/Startup-Repair-frequently-asked-questions

Method 2: Rebuild BCD using the Bootrec.exe tool
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To run the Bootrec.exe tool, you must start Windows RE. To do this, follow these steps:
1. Put the Windows Vista or Windows 7 installation disc in the disc drive, and then start the computer.

2. Press a key when you are prompted. Select a language, a time, a currency, a keyboard or an input method, and then click Next.

3. Click Repair your computer.

4. Click the operating system that you want to repair, and then click Next.

5. In the System Recovery Options dialog box, click Command Prompt.

6. Type Bootrec.exe, and then press ENTER.


Refer the following link for more information:
How to use the Bootrec.exe tool in the Windows Recovery Environment to troubleshoot and repair startup issues in Windows

http://support.microsoft.com/kb/927392

Method 3: Use the Windows Recovery Environment (WinRE) to run System Restore
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1. Insert the Windows 7 installation disc into the disc drive, and then start the computer.
2. Press a key when the message indicating "Press any key to boot from CD or DVD …". appears.
3. Select a language, a time and currency, and a keyboard or input method, and then click Next.
4. Click Repair your computer.
5. In the System Recovery Options dialog box, choose the drive of your Windows installation and click Next 
6. At the System Recovery Options Dialog Box, click on System Restore.
7. Follow the System Restore Wizard instruction as usual and choose the appropriate restore point.
8. Click Finish to restore the system.

To know more about “System Restore” visit the following link:
http://windows.microsoft.com/en-us/windows7/System-Restore-frequently-asked-questions
If the above methods do not help, you may try to follow the methods mentioned in this article:
Error message when you start Windows Vista: "The Windows Boot Configuration Data file is missing required information"
http://support.microsoft.com/kb/927391
Note: This article also applies to Windows 7 Operating system as well.

http://answers.microsoft.com/en-us/windows/forum/windows_7-system/windows-7-bootmgr-is-missing-resolved-using-winre/8bb148bc-8035-4847-9696-888f7a0a9720

Using Link2SD on Gingerbread (Tested on GT-S5830 Galaxy Ace)

If you install Link2SD on Gingerbread, you'll get notification "mount warning" every turn on your handheld. This is caused by two lines in the file init.rc that is marked by #. so you have to remove it so that it becomes like the picture below:

See the top two lines. The two lines that I mean is:
service flash_recovery /system/etc/install-recovery.sh
one shoot

About how to remove the marks on that two lines you need Linux based system. If you won't to do that, you can download the firmware which I have edited here. The firmware on that link is XWKS9 (S5830XWKS9_S5830XEOKP2_XEO).

Below is screenshoot from my GT-S5830 Galaxy Ace before and after apply Link2SD. This is screenshoot after flashing the firmware that I have edited:

Then I install GunsNGlory, Clouds & Sheep and Tank Hero from the market. Available space on internal phone storage is reduced from 151MB to 147MB.

Then I install Link2SD from the market. Here is the screenshot "Storagr Info" from Link2SD before I create link:

 After I create link, internal phone memory increased from 147MB to 150MB. Below is screenshoot from "SD card and phone storage settings" and then Storage Info on Link2SD:

You can download Link2SD from the market.